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A state trooper chases a speeder along a straight stretch of road;both vehicles move at 160 km/h. Thesiren on the trooper's vehicle produces sound at a frequency of600 Hz and the speed of sound in theair is 343 m/s. What is the Doppler shift in the frequency heard by the speeder?
Hz
The warranty on a new tire says that an automobile can travel for adistance of 96 000 km before the tire wears out. The radius of thetire is 0.31 m. How many revolutions does the tire make beforewearing out?
Three forces in the x-y plane act on a 5.5 kg mass: 10.3 N directed at 37°, 12.2 N directed at 128 °, and 4.1 N directed at 201° . Calculate the direction of the resultant force
A copper rod of cross-sectional area 14.5 cm2 has one end immersed in boiling water and the other in an ice-water mixture, How many grams of ice melt each second
A 1 kg stone is thrown upward from a 20 m building with a vertical velocity of 15 m/s. Compute The velocity at impact with the ground
Assume you are a scuba diver preparing for a 30m dive into sea water of density 1025 kg/m3, what volume will be in your lungs at a depth of 15m? at 30m
A ray of light is incident on the surface of a block of clear ice at an angle of 35.0° with the normal. obtain the angle between the reflected and refracted light
A bowling ball (m = 7.2 kg, r = 0.11 m) and a billiard ball (m =0.38 kg, r = 0.028 m) may each be treated as uniform spheres. Whatis the magnitude of the maximum gravitational force that each canexert on the other?
A firehose 15 m long is uncoiled by pulling the nozzle end horizontally along a frictionless surface at the steady speed of 2.9 m/s. How much work has been done on the hose
A bartender slides a beer mug at 1.8 m/s towards a customer at the end of a frictionless bar that is 1.4 m tall. What are the speed and direction of the mug at impact
A section of copper transmission line carries a steady current of 265A and has resistance 0.82 ohem, Ignoring the energy needed to refrigerate the superconductor, how much energy will be saved in one year
An electron in a hydrogen atom is orbiting the nucleus at 2.2x106 m/s. If we treat the electron as a classical current loop orbiting the nucleus
A string is 41.0 cm long and has a mass of 3.00 g. A wave travels at 4.20 m/s along this string. what is the speed of a wave along the second string
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